convert pair styles gauss to gromacs

\documentclass[12pt]{article}

\pagestyle{empty}

\begin{document}

$$

   E = - A \exp(-B r^2) \qquad r < r_c

$$

\end{document}

\documentclass[12pt]{article}

\pagestyle{empty}

\begin{document}

\begin{eqnarray*}

 E = & \frac{H}{\sigma_h\sqrt{2\pi}} \exp\left[-\frac{(r-r_{mh})^2}{2\sigma_h^2}\right]

\end{eqnarray*}

\end{document}